Electric-arc lamp



(No Model.)

W. JANDUS. ELECTRIC ARG LAMP.

No. 4685154. Patented Nov. 17,1891.

[N VEN T OR WNW/58555.

UNITED STATES PATENT OFFICE.

\VILLIAM JANDUS, OF CLEVELAND, OIIIO. o

ELECTRIC-ARC LAMP.

SPECIFICATION forming part of Letters Patent No. 463,154, dated November 17, 1891.

Application filed December 4, 1885. Serial No. 220,658. (No model.)

To all whom it may concern.-

Be it known that I, WILLIAM J ANDUS, a citizen of the United States, and a resident of Cleveland, county of Cuyahoga, and State of Ohio, have invented certain new and useful Improvements in Electric Lamps, of which the following is a specification, the principle of the invention being herein explained and the best mode in which I have contemplated applying that principle so as to distinguish it from other inventions.

The object of my invention is to adapt to the present open-air arc lamp a practical device design ed to retard the waste of electrodes by oxidation.

The annexed drawings and the following description set forth in detail mechanical forms embodying my invention, such detail constructions being but examples of various mechanical forms in which the principle of the invention may be used.

In said drawings, Figure I represents a vertical section of one form of my improved device, showing a part of the upper carbonholder and the two carbons; Fig. II, a similar section of another form, and Fig. III a section of the device applied to an electric candle.

In the drawings, the letter A indicates the upper carbon-holding rod havingits lower end a reduced and screw-threaded. Said reduced and screw-threaded end a is screwed into a screw-threaded bore Z) in a metallic cap B, having the lower portion of its interior cavity screw-threaded. The carbon-holding rod and the cap are electrically connected, the cap forming a part of the carbon-holder. A carbon socket c is screwed into the cavity of the cap B and is cut away for a portion of its upper end, a clamping-block cl fitting in said cutaway portion and having a set-screw 6 bearing against it, said screw passing through a screw-threaded opening f in the cap. The lower end of the cap has a flange and the lower end of the socket has a flange o, and the inwardly-bent flange r of a globe (J of glass or other transparent or translucent refractory material is clamped between said flanges, having gaskets or packing-rings m m, of asbestos, interposed between said flanges and the flanges g and o. The globe is pref erably of cylindrical shape, is open at the lower end, and has a hermetically-closed joint Said collar clamps an outwardly-projeeting flange l upon the upper edge of the globe. The

other parts of the device are like the parts illustrated in Fig. I, the form illustrated in this figure, Fig. II, being simply to show the application of the device to a globe having an outwardly-projecting flange.

In Fig. III of the drawings the device is illustrated applied to an electric candle, the globe being in this case shown as formed integrally closed at its upper end and held with its open lower end upon the base Pby means of suitable clamps 00 y. In this device I accomplish a desirable end, which has not to my knowledge been accomplished by other attachments for are lamps. The combustion at the are within the globe will rarefy the air within the latter and will consume the oxygen of the air contained within the globe, whereupon the carbonous gases thus produced will prevent air from passing up to the arc, with the exception of the small quantity which may gradually be admitted by the mingling of the surrounding air with the inclosed gases at the open bottom of the globe. There can be absolutely no circulation of air in the globe 011 account of the hermetic closing of the upper end of the same, and this latter point, the complete hermetic closing of the upper end of the globe, I consider and have found by practical experiments to be the essential point of advantage in my invention.

As the globe and holder for the same are rigidly connected to the carbon-holder, the point of the arc can never be brought near to the open lower end of the globe by consuniption of the carbons, as would be liable to 'happen if the globe were separately supported from the carbon-holder. The carbons may be renewed and trimmed as easily as in any are lamp now in use, and the device may be attached to any are lamp, and will effect, as I have found by practice and experiments,

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a saving of about eighty-five per cent. in the consumption of the carbons. While this item will not amount to any considerable sum as far as the cost of carbons is concerned, the saving will reside in the less amount of attention required by,the lamps on account of the longer life of the carbons.

All cinders and particles of solid carbon may freely escape at the open lower end of the globe, and the globe will besides its other offices fill the office of the common open globes now used in protecting the are from atmospheric disturbances.

The foregoing description and the accompanying drawings, set forth in detail, are mechanisms embodying my invention. Changes may be made in the same, provided the principles respectively recited in the following claims are employed.

I therefore particularly point out and distinctly claim as my invention 1. In an arc lamp, an arc-inclosin g chamber I hermetically closed at all points excepting at its lower end, substantially as set forth.

2. In an arc lamp, the combination, with a carbon-holder, of an arc-inclosing globe open at its lower end and hermetically closed at all other points and hermetically joined at its upper end to the lower end of said carbonholder, substantially as set forth.

- 3. In an arc lamp, the combination of a carbon-holding rod, a carbon-clamp at the lower end of said rod, and an arc-inclosing globe open at its lower end and hermetically joined to said rod and clamp at its upper end, substantially as set forth.

4:. In an arc lamp, the combination of a carbon-holding rod, a hermetically-closed cap at the lower end of said rod, a carbon-clamp within said cap, and an arc-inclosing globe open at its lower end and hermetically joined to the lower edge of said cap, substantially as set forth.

5. In an arc lamp, the combination of a carbon-holding rod, a hermetically-closed cap at the lower end of said rod, having a flange lower end and provided with a flange at its upper end hermetically clamped against the flange of said cap, substantially as set forth.

6. In an arc lamp, the combination, with a carbon-clamp inclosed in a cap closed at the top and a depending arc-inclosing globe more or less open at its lower part and having an annular flange at its connecting portion, of two asbestus packing-rings respectively located on opposite sides of said flange, and a clamping device which fastens together said cap, flange, and asbestus rings, substantially as set forth.

7. In an arc lamp, the combination of a cap, an arc-inclosing globe open at its lower end and hermetically joined at its upper end to said cap. a carbon-holding socket screwed into said cap and having a cut-away portion, a clamping-block in said cut-away portion, and a set-screw inserted through said cap to bear against said clamping-block, substantially as set forth.

, 8. In an arc lamp, the combination, with a closed cap B, having an annular flange, and a depending arc-inclosing globe open at its lower part and formed with an annular flange at its upper portion, of packing and a clamp which secures together said cap-flange, said globe-flange, and said packing, together with the carbon-socket'c, inclosed within said cap,

adjustable clamping-block CI, and set-screw e, substantially as described.

In testimony that I claim the foregoing to be my invention I have hereunto set myhand this 11th day of November, A. D. 1886.

WILLIAM J ANDUS. lVitnesses:

T. B. HALL, W. D. PUDNEY. 

